With a fluid bed dryer the drying air is more evenly distributed over the product. As a result, the drying air supply temperature and the product exit temperature can be maintained at constant, economical level, resulting in lower energy costs. A rotary drum dryer requires often a separate cooler. The cooler area represents about half the size of the fluid bed area and in the dry mortar industry cooling is usually required. A continuous fluid-bed dryer/cooler will always be smaller for a given throughput than a rotary drum installation. The operation of the continuous fluid-bed dryer/cooler is not influenced by weather conditions. Control is easier and product quality is constant and maintenance costs are low. Most of the dry mortar plants built in last few years include a continuous fluid bed dryer/cooler. The fluid bed dryer/cooler is replacing rotary drums in a number of older dry mortar plants.